A glove box is a sealed enclosure that allows handling in a special atmosphere. In a nuclear industry company, the humidity inside the glove boxes (where the plutonium oxide is conditioned) must be continuously monitored and kept as low as possible (less than −45°C frost temperature). Since 2015, Several hygrometers of different technologies have been tested including electrolytic hygrometers, with dew point, and a new type of equipment measuring a very low humidity. This device is an infrared laser spectrometer based on the absorption spectrum of water. After a first on-site test of the hygrometer, a metrological qualification of the device was carried out in the laboratory. Several cycles of measurements have been carried out to validate certain technical specifications of this analyzer. The tests included linearity, repeatability, checking of the calculation formulas in the analyzer’s internal software, the influence of different parameters and drift in time. All the results and conclusions allowed to confirm the metrological qualities of this H20 analyzer and to propose a suitable verification program.

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